2 * fs/cifs/smb2transport.c
4 * Copyright (C) International Business Machines Corp., 2002, 2011
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Jeremy Allison (jra@samba.org) 2006
8 * Pavel Shilovsky (pshilovsky@samba.org) 2012
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/list.h>
27 #include <linux/wait.h>
28 #include <linux/net.h>
29 #include <linux/delay.h>
30 #include <linux/uaccess.h>
31 #include <asm/processor.h>
32 #include <linux/mempool.h>
33 #include <linux/highmem.h>
34 #include <crypto/aead.h>
37 #include "cifsproto.h"
38 #include "smb2proto.h"
39 #include "cifs_debug.h"
40 #include "smb2status.h"
44 smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
46 return cifs_alloc_hash("hmac(sha256)",
47 &server->secmech.hmacsha256,
48 &server->secmech.sdeschmacsha256);
52 smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
54 struct cifs_secmech *p = &server->secmech;
57 rc = cifs_alloc_hash("hmac(sha256)",
63 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
69 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
73 #ifdef CONFIG_CIFS_SMB311
75 smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
77 struct cifs_secmech *p = &server->secmech;
80 rc = cifs_alloc_hash("hmac(sha256)",
86 rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
90 rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
97 cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
98 cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
103 static struct cifs_ses *
104 smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
106 struct cifs_ses *ses;
108 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
109 if (ses->Suid != ses_id)
118 smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
120 struct cifs_ses *ses;
122 spin_lock(&cifs_tcp_ses_lock);
123 ses = smb2_find_smb_ses_unlocked(server, ses_id);
124 spin_unlock(&cifs_tcp_ses_lock);
129 static struct cifs_tcon *
130 smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid)
132 struct cifs_tcon *tcon;
134 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
135 if (tcon->tid != tid)
145 * Obtain tcon corresponding to the tid in the given
150 smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid)
152 struct cifs_ses *ses;
153 struct cifs_tcon *tcon;
155 spin_lock(&cifs_tcp_ses_lock);
156 ses = smb2_find_smb_ses_unlocked(server, ses_id);
158 spin_unlock(&cifs_tcp_ses_lock);
161 tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
162 spin_unlock(&cifs_tcp_ses_lock);
168 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
171 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
172 unsigned char *sigptr = smb2_signature;
173 struct kvec *iov = rqst->rq_iov;
174 int iov_hdr_index = rqst->rq_nvec > 1 ? 1 : 0;
175 struct smb2_sync_hdr *shdr =
176 (struct smb2_sync_hdr *)iov[iov_hdr_index].iov_base;
177 struct cifs_ses *ses;
179 ses = smb2_find_smb_ses(server, shdr->SessionId);
181 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
185 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
186 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
188 rc = smb2_crypto_shash_allocate(server);
190 cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
194 rc = crypto_shash_setkey(server->secmech.hmacsha256,
195 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
197 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
201 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
203 cifs_dbg(VFS, "%s: Could not init sha256", __func__);
207 rc = __cifs_calc_signature(rqst, iov_hdr_index, server, sigptr,
208 &server->secmech.sdeschmacsha256->shash);
211 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
216 static int generate_key(struct cifs_ses *ses, struct kvec label,
217 struct kvec context, __u8 *key, unsigned int key_size)
219 unsigned char zero = 0x0;
220 __u8 i[4] = {0, 0, 0, 1};
221 __u8 L[4] = {0, 0, 0, 128};
223 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
224 unsigned char *hashptr = prfhash;
226 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
227 memset(key, 0x0, key_size);
229 rc = smb3_crypto_shash_allocate(ses->server);
231 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
232 goto smb3signkey_ret;
235 rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
236 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
238 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
239 goto smb3signkey_ret;
242 rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
244 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
245 goto smb3signkey_ret;
248 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
251 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
252 goto smb3signkey_ret;
255 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
256 label.iov_base, label.iov_len);
258 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
259 goto smb3signkey_ret;
262 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
265 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
266 goto smb3signkey_ret;
269 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
270 context.iov_base, context.iov_len);
272 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
273 goto smb3signkey_ret;
276 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
279 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
280 goto smb3signkey_ret;
283 rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
286 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
287 goto smb3signkey_ret;
290 memcpy(key, hashptr, key_size);
301 struct derivation_triplet {
302 struct derivation signing;
303 struct derivation encryption;
304 struct derivation decryption;
308 generate_smb3signingkey(struct cifs_ses *ses,
309 const struct derivation_triplet *ptriplet)
313 rc = generate_key(ses, ptriplet->signing.label,
314 ptriplet->signing.context, ses->smb3signingkey,
319 rc = generate_key(ses, ptriplet->encryption.label,
320 ptriplet->encryption.context, ses->smb3encryptionkey,
325 rc = generate_key(ses, ptriplet->decryption.label,
326 ptriplet->decryption.context,
327 ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
332 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
333 cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
335 * The session id is opaque in terms of endianness, so we can't
336 * print it as a long long. we dump it as we got it on the wire
338 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
340 cifs_dbg(VFS, "Session Key %*ph\n",
341 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
342 cifs_dbg(VFS, "Signing Key %*ph\n",
343 SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
344 cifs_dbg(VFS, "ServerIn Key %*ph\n",
345 SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey);
346 cifs_dbg(VFS, "ServerOut Key %*ph\n",
347 SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey);
353 generate_smb30signingkey(struct cifs_ses *ses)
356 struct derivation_triplet triplet;
357 struct derivation *d;
359 d = &triplet.signing;
360 d->label.iov_base = "SMB2AESCMAC";
361 d->label.iov_len = 12;
362 d->context.iov_base = "SmbSign";
363 d->context.iov_len = 8;
365 d = &triplet.encryption;
366 d->label.iov_base = "SMB2AESCCM";
367 d->label.iov_len = 11;
368 d->context.iov_base = "ServerIn ";
369 d->context.iov_len = 10;
371 d = &triplet.decryption;
372 d->label.iov_base = "SMB2AESCCM";
373 d->label.iov_len = 11;
374 d->context.iov_base = "ServerOut";
375 d->context.iov_len = 10;
377 return generate_smb3signingkey(ses, &triplet);
380 #ifdef CONFIG_CIFS_SMB311
382 generate_smb311signingkey(struct cifs_ses *ses)
385 struct derivation_triplet triplet;
386 struct derivation *d;
388 d = &triplet.signing;
389 d->label.iov_base = "SMBSigningKey";
390 d->label.iov_len = 14;
391 d->context.iov_base = ses->preauth_sha_hash;
392 d->context.iov_len = 64;
394 d = &triplet.encryption;
395 d->label.iov_base = "SMBC2SCipherKey";
396 d->label.iov_len = 16;
397 d->context.iov_base = ses->preauth_sha_hash;
398 d->context.iov_len = 64;
400 d = &triplet.decryption;
401 d->label.iov_base = "SMBS2CCipherKey";
402 d->label.iov_len = 16;
403 d->context.iov_base = ses->preauth_sha_hash;
404 d->context.iov_len = 64;
406 return generate_smb3signingkey(ses, &triplet);
411 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
414 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
415 unsigned char *sigptr = smb3_signature;
416 struct kvec *iov = rqst->rq_iov;
417 int iov_hdr_index = rqst->rq_nvec > 1 ? 1 : 0;
418 struct smb2_sync_hdr *shdr =
419 (struct smb2_sync_hdr *)iov[iov_hdr_index].iov_base;
420 struct cifs_ses *ses;
422 ses = smb2_find_smb_ses(server, shdr->SessionId);
424 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
428 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
429 memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
431 rc = crypto_shash_setkey(server->secmech.cmacaes,
432 ses->smb3signingkey, SMB2_CMACAES_SIZE);
435 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
440 * we already allocate sdesccmacaes when we init smb3 signing key,
441 * so unlike smb2 case we do not have to check here if secmech are
444 rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
446 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
450 rc = __cifs_calc_signature(rqst, iov_hdr_index, server, sigptr,
451 &server->secmech.sdesccmacaes->shash);
454 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
459 /* must be called with server->srv_mutex held */
461 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
464 struct smb2_sync_hdr *shdr =
465 (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
467 if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
468 server->tcpStatus == CifsNeedNegotiate)
471 if (!server->session_estab) {
472 strncpy(shdr->Signature, "BSRSPYL", 8);
476 rc = server->ops->calc_signature(rqst, server);
482 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
485 char server_response_sig[16];
486 struct smb2_sync_hdr *shdr =
487 (struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
489 if ((shdr->Command == SMB2_NEGOTIATE) ||
490 (shdr->Command == SMB2_SESSION_SETUP) ||
491 (shdr->Command == SMB2_OPLOCK_BREAK) ||
492 (!server->session_estab))
496 * BB what if signatures are supposed to be on for session but
497 * server does not send one? BB
500 /* Do not need to verify session setups with signature "BSRSPYL " */
501 if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
502 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
506 * Save off the origiginal signature so we can modify the smb and check
507 * our calculated signature against what the server sent.
509 memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
511 memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
513 mutex_lock(&server->srv_mutex);
514 rc = server->ops->calc_signature(rqst, server);
515 mutex_unlock(&server->srv_mutex);
520 if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
527 * Set message id for the request. Should be called after wait_for_free_request
528 * and when srv_mutex is held.
531 smb2_seq_num_into_buf(struct TCP_Server_Info *server,
532 struct smb2_sync_hdr *shdr)
534 unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
536 shdr->MessageId = get_next_mid64(server);
537 /* skip message numbers according to CreditCharge field */
538 for (i = 1; i < num; i++)
539 get_next_mid(server);
542 static struct mid_q_entry *
543 smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr,
544 struct TCP_Server_Info *server)
546 struct mid_q_entry *temp;
548 if (server == NULL) {
549 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
553 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
554 memset(temp, 0, sizeof(struct mid_q_entry));
555 temp->mid = le64_to_cpu(shdr->MessageId);
556 temp->pid = current->pid;
557 temp->command = shdr->Command; /* Always LE */
558 temp->when_alloc = jiffies;
559 temp->server = server;
562 * The default is for the mid to be synchronous, so the
563 * default callback just wakes up the current task.
565 temp->callback = cifs_wake_up_task;
566 temp->callback_data = current;
568 atomic_inc(&midCount);
569 temp->mid_state = MID_REQUEST_ALLOCATED;
574 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
575 struct mid_q_entry **mid)
577 if (ses->server->tcpStatus == CifsExiting)
580 if (ses->server->tcpStatus == CifsNeedReconnect) {
581 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
585 if (ses->status == CifsNew) {
586 if ((shdr->Command != SMB2_SESSION_SETUP) &&
587 (shdr->Command != SMB2_NEGOTIATE))
589 /* else ok - we are setting up session */
592 if (ses->status == CifsExiting) {
593 if (shdr->Command != SMB2_LOGOFF)
595 /* else ok - we are shutting down the session */
598 *mid = smb2_mid_entry_alloc(shdr, ses->server);
601 spin_lock(&GlobalMid_Lock);
602 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
603 spin_unlock(&GlobalMid_Lock);
608 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
611 unsigned int len = mid->resp_buf_size;
613 struct smb_rqst rqst = { .rq_iov = iov,
616 iov[0].iov_base = (char *)mid->resp_buf;
617 iov[0].iov_len = len;
619 dump_smb(mid->resp_buf, min_t(u32, 80, len));
620 /* convert the length into a more usable form */
621 if (len > 24 && server->sign && !mid->decrypted) {
624 rc = smb2_verify_signature(&rqst, server);
626 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
630 return map_smb2_to_linux_error(mid->resp_buf, log_error);
634 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
637 struct smb2_sync_hdr *shdr =
638 (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
639 struct mid_q_entry *mid;
641 smb2_seq_num_into_buf(ses->server, shdr);
643 rc = smb2_get_mid_entry(ses, shdr, &mid);
646 rc = smb2_sign_rqst(rqst, ses->server);
648 cifs_delete_mid(mid);
655 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
658 struct smb2_sync_hdr *shdr =
659 (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
660 struct mid_q_entry *mid;
662 smb2_seq_num_into_buf(server, shdr);
664 mid = smb2_mid_entry_alloc(shdr, server);
666 return ERR_PTR(-ENOMEM);
668 rc = smb2_sign_rqst(rqst, server);
670 DeleteMidQEntry(mid);
678 smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
680 struct crypto_aead *tfm;
682 if (!server->secmech.ccmaesencrypt) {
683 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
685 cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
689 server->secmech.ccmaesencrypt = tfm;
692 if (!server->secmech.ccmaesdecrypt) {
693 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
695 crypto_free_aead(server->secmech.ccmaesencrypt);
696 server->secmech.ccmaesencrypt = NULL;
697 cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
701 server->secmech.ccmaesdecrypt = tfm;